Electrical timing device



Oct. 13, 1942. J DUGAN 2,298,687

ELECTRICAL TIMING DEVICE Filed Nov. 19, 1941 INVENTOR.

4 BY {7M Patented Oct. 13, 1942 UNITED STATES PATENT OFFICE ELECTRICAL TIMING DEVICE Peter J. Dugan, Crestwood, N. Y.

Application November 19, 1941, Serial No. 419,737

8 Claims.

- out my invention.

Referring to the drawing in detail, there is a line switch I which when closed connects the timing device to a source of electrical energy thereby placing it in condition for operation. When the switch I 8 is closed, a coil II' of a control relay I I connected to the line through conductors 30, 3|, contacts I2 and conductors 32, is energized, causing the control relay I I to operate to close contacts I3, I4 and I5. The control relay I I is of such a type that when the coil II is not energized, the contacts I3, l4 and I will automatically open.

The closing of contacts l3 and I4 connects a motor N5 of a motor generator set and its series field coil I! to the line through conductors 33, 34, 35 and 35. This places the motor I6 in operation, driving the generator I8 and a flywheel I9 mounted on a drive shaft connecting the motor I8 and the generator I8.

The closing of contacts I5 by the control relay II energizes a coil 28' of a differential relay 28. The coil 20' is connected to the line through conductors 36, 37, 38, 39 and 32 and contacts I5. The differential relay 20 is so arranged that the effect of the coil 28 is opposed by the effect of a second coil 28" connected through conductors 40 and 4| to the output of the generator I8. When the motor I6 brings the generator I8 up to a certain predetermined speed, the generator I8 will supply sufficient energy to the coil 28 so that the effect of the coil 28" will overcome that of the opposing coil 20'. Due to the action of this coil 28", the differential relay 2!] will operate to open contacts I2 and to close contacts 2 I. The differential relay is of a type that when the coils are de-energized the contacts I2 and 2| will automatically return to their original conditions.

The opening of contacts I2 interrupts the circuit to the control relay I I, de-energizing the coil II of that relay and thereby permitting contacts I 3, I4 and I5 to open. The closing of contacts ZI places the circuit being controlled in operation or, in other words, completes the circuit to the work.

During the time required to bring the generator I8 up to a speed suflicient to operate the differential relay 28, contacts 2| have been open and the working circuit inoperative. This time may be regulated by varying an adjustable resistance 22 connected in series with the shunt field 23 of the generator I8 across its output in parallel with the coil 28" of the differential relay. This arrangement permits this time to be easily regulated within very close limits.

After contacts 2I have been closed, they will remain closed as long as the generator I8 continues to supply current to the coil 20 of the differential relay 20. This is due to the fact that the circuit to the first-mentioned coil 20 of the differential relay 2!! is interrupted by the opening of the contacts I5, as described, and the opposing coil 20 no longer has to overcome the effect of that coil.

After the motor I8 has been disconnected from the'line by the opening of contacts I3 and I4, as described, so that the motor no longer drives the generator I 8, the rotation of the generator I8 continues due to the flywheel I9 and current is supplied to the coil 28" of the differential relay 28 until the generator comes to rest. The time during which the generator will continue to operate under such conditions depends on the characteristics of the flywheel I9 and the inertia forces stored therein.

When the generator I8 stops its rotation and ceases to supply current to the coil 20" of the differential relay, the differential relay 28 is no longer energized and permits contacts I2 to close and contacts 2I to open. To neutralize any residual effect in the coil 20" connected to the generator I8, the opposing coil 20' is connected to the line through a high resistance 24 which is selected so that it will permit only enough current to flow through it and the coil'ZD to neutralize such effect, thus insuring operation of the differential relay 20 when the generator I8 comes to rest.

The opening of contacts 2I interrupts the Working circuit and the closing of contacts I2 completes the circuit to the coil II of the control relay II so that the sequence of operations just described will be repeated.

In describing my invention I have, for purposes of illustration, shown one working circuit as being controlled through contacts 2| operated by the differential relay 20; however, this maybe modified so that these contacts are operated by the control relay II; or so that circuits are operated by both relays if desired. In other words, the timing device described herein may be utilized in various ways depending upon the conditions and requirements to be met and it is not intended to limit it to the particular use shown and described herein. One application of my device is shown in my copending application, Serial'No. 394,493.

It will also be understood that while I have shown and described a preferred embodiment of my invention, various modifications may be made cal energy, a circuit connecting the opposing coil of the differential relay to the generator and means controlled by the differential relay to control the motor circuit and the circuit to the firstmentioned coil of the differential relay.

2. An electrical timing device for controlling the intermittent operation of an electrical circuit including a motor generator sethaving a flywheel acting in conjunction therewith, a circuit connecting the motor to a source of electrical energy, a differential relay having a pair of opposing coils, a circuit connecting one coil'of the differential relay to a source of electrical energy, a circuit connecting the opposing coil of the differential relay to the generator, means controlled by the diiferential relay to control the motor circuit and the circuit to the firstmentioned coil of the differential relay comprising a control relay controlling the motor circuit and the circuit to the first-mentioned coil of the differential relay, and a circuit connecting the control relay to a source of electrical energy, .said circuit being controlled by the operation of the differential relay.

3. An electrical timing device for controlling the intermittent operation of an .electrical'circuit including a motor generator set having a flywheel acting in conjunction therewith, a circuit connecting the motor to a source of electrical energy, a differential relay having a pair of opposing coils, a circuit connecting one coil of the differential relay to a source of electrical energy, a circuit connecting the opposing coil of the differential relay to the generator, means controlled by the differential relay to control the motor circuit and'the circuit to the first-mentioned coil'of the differential relay, and means to regulate the current supplied to the differential relay by the generator.

l. An electrical timing device for controlling the intermittent operation of an electrical circuit including a motor generator set having a flywheel acting in conjunction therewith, a circuit connecting the motor to a source of electrical energy,

a differential relay having a pair of opposing coils, a circuit connecting one coil of the differential relay to a source of electrical energy, a circuit connecting the opposing coil of the differential relay to'the generator, means controlled by the differential relay to control the motor circuit and the circuit to the first-mentioned coil of the differential relay comprising a control rewheel acting in conjunction therewith, a circuit connecting the motor to a source of electrical energy, a differential relay having a pair of opposing coils, a circuit connecting one coil of the differential relay toa source of electrical energy, a circuit connecting the opposing coil of the differential relay to the generator, means controlled by the differential relay to control the motor circuit and the circuit to the first-mentioned coil of the differential relay, and means controlled by the differential relay to intermittently operate a working circuit.

6. An electrical timing device for controlling the intermittent operation of an electrical circuit including a motor generator set having a flywheel acting in conjunction therewith, a circuit connecting the motor to a source of electricalen ergy, a differential relay having a pair of opposing coils, a circuit connecting one coil of the differential relay to a source of electrical energy, a circuit connecting the opposing coil of the differential relay to the generator, means controlled by the differential relay to control the motor circuit and the circuit to the first-mentioned coil of the differential relay, means to regulate the current supplied to the differential relay by the generator, and means controlled by the differential relay to intermittently operate a working circuit.

7. An electrical timing device for controlling the intermittent operation of an electrical circuit including a motor generator set having a flywheel acting in conjunction therewith, a circuit connecting the motor to a source of electrical energy, a differential relay having a pair of opposing coils, a circuit connecting one coil of the differential relay to a source of electrical energy, a circuit connecting the opposing coil of the differential relay to the generator, means controlled by the differential relay to control the motor circuit and the circuit to the first-mentioned coil of the differential relay comprising a control relay controlling the motor circuit and the circuit to the first-mentioned coil of the differential relay, a circuit connecting the control relay to a source of electrical energy, said circuit being controlled by the operation of the differential relay, and means controlled by the differential relay to intermittently operate a Working circuit.

8. An electrical timing device for controlling the intermittent operation of an electrical circuit including a motor generator set having a flywheel acting in conjunction therewith, a circuit connecting the motor to a source of electrical energy, a differential relay having a pair of opposing coils, a circuit connecting one coil of the differential relay to a source of electrical energy, a circuit connecting the opposing coil of the differential relay to the generator, means controlled by the differential relay to control the motor circuit and the circuit to the first-mentioned coil of the differential relay comprising a control relay controlling the motor circuit and the circuit to the first-mentioned coil of the differential relay, a circuit connecting the control relay to a source of electrical energy, said circuit being controlled by the operation of the differential relay, means to regulate the current sup plied to the diiferential relay by the generator, and means controlled by the differential relay to intermittently operate a working circuit.

PETER J. DUGAN. 

